1644149 has 4 divisors (see below), whose sum is σ = 1770636. Its totient is φ = 1517664.

The previous prime is 1644143. The next prime is 1644163. The reversal of 1644149 is 9414461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 1423249 = 470^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644149 - 2⁸ = 1643893 is a prime.

It is a super-3 number, since 3×1644149³ = 13333518649471919847, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63224 + ... + 63249.

It is an arithmetic number, because the mean of its divisors is an integer number (442659).

2^1644149 is an apocalyptic number.

It is an amenable number.

1644149 is a deficient number, since it is larger than the sum of its proper divisors (126487).

1644149 is a wasteful number, since it uses less digits than its factorization.

1644149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126486.

The product of its digits is 3456, while the sum is 29.

The square root of 1644149 is about 1282.2437365805. The cubic root of 1644149 is about 118.0267343428.

The spelling of 1644149 in words is "one million, six hundred forty-four thousand, one hundred forty-nine".